镀液纳米金刚石浓度及不同电流密度下镍-纳米金刚石复合镀层的形貌及力学性能  

Morphology and Mechanical Properties of Ni/Nano- Diamond Composite Coatings Prepared at Different Current Density in Different Nano-Diamond Concentrations

作　　者：刘美华[1] 赵洋[1,2] 孟毅[1] 李菲辉 巩运兰[1] 冯露[2] 

机构地区：[1]天津商业大学机械工程学院,天津300134 [2]天津大学机械工程学院,天津300072

出　　处：《材料保护》2016年第1期1-5,共5页Materials Protection

基　　金：国家自然科学基金资助项目(11272231);天津市自然科学基金项目(15JCYBJC48000)资助

摘　　要：为了进一步探讨制备高强度镍-纳米金刚石复合镀层的技术,采用瓦特镀液和直流电沉积方法制备了镍-纳米金刚石复合镀层,研究了沉积电流密度、镀液中纳米金刚石浓度对Q235A钢表面镍-纳米金刚石复合镀层形貌、织构及力学性能的影响。采用D/MAX-2500 X射线衍射仪分析了复合镀层的晶体结构及残余应力,采用X650扫描电镜(SEM)观察了其表面形貌及纳米金刚石的分布,采用Nano Indenter XP型纳米力学测试系统测试了复合镀层的硬度及弹性模量。结果表明:当镀液中纳米金刚石浓度为8.0 g/L,电流密度为3 A/dm2时,复合镀层中的纳米金刚石含量最高,达到14.35%(质量分数),硬度、弹性模量分别达到5.302,254.356 GPa;复合镀层的平均晶粒尺寸由镍镀层的30.8 nm减小到20.4 nm,择优取向由镍镀层的(111)晶面转变为(200)晶面。Ni/nano- diamond composite coatings were prepared by direct current electrodeposition in Watt nickel plating bath,and the influences of current density and nano-diamond concentrations on the structure,texture and mechanical properties of composite coatings were investigated.Subsequently,the X-ray diffractometer was used to study the crystal place structure and residual stress of composite coatings,and the scanning electron microscope(SEM) was used to observe the surface morphology and the distribution of nano-diamond.The hardness and elasticity modulus of composite coatings were analyzed by nano indenter.Results showed that when the nano-diamond concentration was 8.0 g/L and the current density was 3 A/dm^2,the content of nano-diamond in composite coating was up to 14.35%,and the hardness and elasticity modulus reached up to 5.302 GPa and 254.356 GPa.Furthermore,average grain size of Ni/nano-diamond composite coating decreased from 30.8 nm to 20.4 nm,and the preferred orientation transformed from(111) into(200).

关 键 词：镍-纳米金刚石复合镀 纳米金刚石浓度 电流密度 镀层形貌 力学性能 

分 类 号：TQ153[化学工程—电化学工业]